The Anterior Sacroiliac Ligament (ligamentum sacroiliacum anterius) (Fig. 319).The anterior sacroiliac ligament consists of numerous thin bands, which connect the anterior surface of the lateral part of the sacrum to the margin of the auricular surface of the ilium and to the preauricular sulcus.

The Posterior Sacroiliac Ligament (ligamentum sacroiliacum posterius) (Fig. 320).The posterior sacroiliac ligament is situated in a deep depression between the sacrum and ilium behind; it is strong and forms the chief bond of union between the bones. It consists of numerous fasciculi, which pass between the bones in